Giveaway: 2+2=? 100 points. whoever answers first gets 100

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

The triangles are similar. what is the value of x? show your work.